Regulator for shunt-wound dynamos or other electrical apparatus



(No Model.) 2 Sheets-Sheet 1.

L. s. HARRIS. REGULATOR FOR SHUNT WOUND DYNAMOS OR OTHER ELECTRICAL APPARATUS. No. 411,551. gan tegfiept. 24, 1889.

ei a 'l 5 I L/ WITMSSES LW/LWTOR fliiomey.

N. PETERS, Phom-Lnlw m hcr. Wnshmgwn. D. L.

2 Sheets-Sheet 2.

(No Model.)

L. S. HARRIS. REGULATOR FOR SHUNT WOUND DYNAMOS 0R OTHERVELEGTRIGAL APPARATUS.

g Patented Sept. 24, 1889.

N E l N IWVEWTOR QM J 7mm YIHWESSFS film,

UNITED STATES PATENT OFFICE.

LANDER S. HARRIS, OF DETROIT, MICHIGAN.

REGULATOR FOR SHUNT-WOUND DYNAMOS OR OTHER ELECTRICAL APPARATUS.

SPECIFICATION forming part of Letters Patent No. 411,551, dated September 24, 1889.

Application filed April 27, 1889. fierial No. 303,881. (N0 model.)

To all whom it may concern:

Be it known that I, LANDER S. HARRIS, a citizen of the United States, residing in Detroit, county of \Vayne and State of Michigan, have invented certain new and useful Iniprovements in Regulators for Shunt-lVound Dynamos or other Electrical Apparatus, of which the following is a specification.

On the 16th of October, 1888, I took out Letters Patent of the United States No. 391,319 for an improvement in electric motors adapted to work with a series machine.

The invention which is the subject of the present application is a modification of the device covered by the said former patent, by which it is adapted to work with a shunt-machine. The distinction will appear in the following description and claims.

I have shown my invention as applied to an electrical motor; but I do not desire to be limited to that particular use of the regulating device, which may be used in connection with other kinds of electrical apparatus.

In the annexed drawings, making a part of this specification, Figure 1 is a side elevation, partly in section, of an electric motor. Fig. 2 is a front view of the same. Fig. 3 is aplan for representing the arrangement of the wires and switch, by means of which the flow of the electrical current is regulated.

The same letters are employed in all the figures in the indication of identical parts.

A is a line-wire leading into the apparatus and furnished with the ordinary safetyfuse. It terminates in a plate B. From this plate the current flows in two directions, a part of it going from the plate to the wire 0 through the armature, while the residue of the current passes through the wires K, &c., to and through the field, both currents being finally brought together and flowing off on the main line. The wire 0 is attached to the plate B and leads to a resistance-coil D, from able switch G to a plate 13, whence it is led by the wire II to the armature M, and passing through the brushes M to the binding-post N and thence through the wire II to a binding-post connected with the extension II of the main line on the other side.

The switch is formed of a non-conductor baiflG pivoted on the central pivot G which stands 011 a wooden bar or plate G G G are two independent metal switclrplates, each attached centrally to the bar G2, and made of spring-brass bent into the form substantially as shown in Fig. 1, so as to press at both ends upon the surface upon which they are intended to act and accommodate themselves to any irregularity thereof.

II, &c., to I are a series of separate plates of metal attached to the base and insulated from one another. These plates are of dilferent width, increasing regularly in each series from I to I, the plates I I I I forming the first series, being of the same width as are the wider plates I I I, forming the second series, and the wider plates 1 I forming the third series, the plate I being as wide as either of the series. A large wire K, properly wound, is attached to the plate I. A wire K' of less diameter and similarly protected, is attached to plate I. A still finer wire K is attached to plate I and the fin est wire of all K is attached to the plate I. Abranch wire K connects the wire K to plate I, another wire K connects K to plate I, another wire K connects the wire K to I, the wire K connects plate I to wire K and the wire K connects plate I to wire K The plate I is also connected by the wire K to wire K The wires K K I K are carried to the field and wound around the cores L L L L and thence they pass by the return wires (shown in Fig. 3) to the binding-post at the end of the line-wire H The switch being arranged as shown in Fig. 3, it will be observed that the metal switch-plate G extends from the plate 13 to the seginentally-arranged plates I I I I and its width at the outer end will therefore be sufficient to touch upon all four of said plates. As a consequence, a part of the current entering through the main line A, and all of it which does not pass out through the wire 0 and the resistance D to the armature, will flow through the plates I I I I to the graded wires K K K K and thence to the extension of the main line I1 In this position of the switch the plate G is connected with the plate F, to which is connected the wire E, taken off at the end of the resistance D, and therefore through which a minimum of the current intended to pass through the armature will pass because it encounters the full force of the resistance. As the plates I I, and I are broader than the plates I, I, I and 1 it follows, therefore, that the end of the switch which was broad enough to cover the four will when that end of the switch is shifted to the left only cover the plates 1 I I", and, as neither of these is connected with the coarse wire K, it follows that that wire which carries the largest part of the current to the field is entirely out out and the current is limited to flow through the wires K K K with which the plates I I I are connected by the branch wires K K K. The same movement of the switch-bar will have carried the switch-plate G to the plate F, which is insulated from the adjoining plates, and the current now passing through 0 will be taken out from the resistance-coil through the Wire 0 to plate F, and thence through the switch to the plate B, and thence to the armature and the main line, as described. As the wire O is connected with the resistance-coil before the wire forming such coil reaches its end, there will be less resistance than there was when the current passed through E, so that the proportion of the current passing through the armature will have been increased, while the portion of the current which goes to field through only three of the wires K K K will have been proportionately diminished. If, again, the switch-bar is turned farther to the left, the switch G Will bear only upon the plates I and 1 which are connected with the wires K and K by the branch wires K and K As now both the wires K and K have been cut out of the circuit, the amount of the entire current pass-- in g through the field-magnet coils will be proportionately diminished. The same movement of the switch-bar will bring the switch G in contact with the insulated plate F which takes the current through the wires 0 from the middle of the resistance, and therefore with 'an increased force of current due to the diminution of resistance. If, again, the switch is turned until the plate G bears only on the plate I", which is as wide as the switch itself, all of the wires to field will be cut out except the finest wire K which is connected bythe branch wire K with the plate I". The same movement of the switchbar will have brought the switch G into contact with the insulated plate F which is connected by the wire C with the resistance still nearer to the receiving end of the resistancecoil, and consequently the current through 0 F B to the wire II and armature will be at its practical maximum, while the current passing to field through the other switch wilt connect only with the finest wire and will only be therefore at its minimum. It will thus be seen that by the described arrangement of the'wires and switch with a shuntmachine the current may not only be divided, but it will automatically be so divided that as the current to armature increases by cutting out more and more of the resistance so the current to field will automatically be diminished by cutting out wires leading to field, and vice versa, so that as the switch is shifted it operates automatically to increase the current on one set of wires and diminish it on the other, the aggregate current remaining the same.

secure by Letters Patent, i s I 1. In combination with the main-line wire of a shunt-machine, a series of wires K K, &c., of different sizes leading to the fieldmagnet, a switch G, to directa portion of the current through one or more of said wires to the field-magnet, a resistance-coil D, and a series of wires E O, &c., and a switch G, to direct the residue of the current passing with more or less resistance through any of said wires to the armature, substantially as set forth.

2. In combination with the line-wire A and a series of field-wires of different sizes, a switch-plate G, and successive series of insulated plates arranged in groups of different numbers but equal aggregate Width, whereby the switch is connected with all or part of the field-wires, substantially as set forth.

3. In combination with the line-wire A and switch-plate G, a series of field-wires of different sizes, groups of plates I I, &c., the first group connected directly to the fieldwires, the next series of one less plates connected by branch wires with all but one of the field-wires, and so on successively with diminishing numbers, but each group in turn occupying a space equal to the full width of the switch-plate, substantially as set forth.

4. In combination with the field-magnet, armature, and line-wire, switch-plates G G, carried on an adjustable switch-bar, a series of wires leading to the field, and plates I I, &c., arranged in groups connecting one or more of said field-wires with the line-wire, and a series of wires leading from the resistance-coil to a series of plates F F, &c., from which a part of the current leads through the switch-plate G to the armature, whereby the force of the current to the field will be increased or diminished and that of the current to the armature be inversely diminished or increased, substantially as set forth.

5. In combination with the field-magnet and armature of a shunt-machine, a group of group of wires having variable resistance leading to the armature, and switch mechanism connected to said wires, substantially as set forth, so that when there is a maximum of current through the field-magnets there wires leading to field and a correspondinghat I claim as myinvention, and desire to V shall be automatically provided a minimum my hand in the presence of two subscribing current to the armature, and vice versa, the Witnesses. current to one decreasing as the current to the other increases by a single movement of LANDER HARRIS 5 the switch mechanism, substantially as set In presence of. forth. R. MASON,

In testimony whereof I have hereunto set KATIE JARVIS. 

